Fix ConstrastEffect in qml-compositor

Specify precision to make the shader working.

Change-Id: I055fe47e1073403dc981274236fa82e091e0eca4
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/examples/qml-compositor/ContrastEffect.qml b/examples/qml-compositor/ContrastEffect.qml
index 5159950d..c284b290 100644
--- a/examples/qml-compositor/ContrastEffect.qml
+++ b/examples/qml-compositor/ContrastEffect.qml
@@ -75,15 +75,15 @@ ShaderEffect {
     vertexShader: source && source.isYInverted ? vShaderInvertedY : vShader
 
     fragmentShader: "
-    uniform sampler2D source;
-    uniform float qt_Opacity;
-    uniform vec4 color;
-    uniform float blend;
+    uniform lowp sampler2D source;
+    uniform highp float qt_Opacity;
+    uniform highp vec4 color;
+    uniform highp float blend;
     varying highp vec2 qt_TexCoord0;
     void main() {
-        vec4 sourceColor = texture2D(source, qt_TexCoord0);
-        vec3 delta = sourceColor.rgb - vec3(0.5);
-        vec3 lowerContrast = vec3(0.5) + 0.4 * delta;
+        highp vec4 sourceColor = texture2D(source, qt_TexCoord0);
+        highp vec3 delta = sourceColor.rgb - vec3(0.5);
+        highp vec3 lowerContrast = vec3(0.5) + 0.4 * delta;
         gl_FragColor = qt_Opacity * mix(sourceColor, color * sourceColor.a * dot(lowerContrast, vec3(11, 16, 5) * (1. /  32.)), blend);
     }
     "